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Inferring Neutron star properties with SpiRIT heavy-ion collision experiment.

ORAL

Abstract

The material that Neutron star (NS) composes of is similar to the overlap region created temporarily from the collisions of heavy ions because they are both described by the same nuclear Equation of State (EoS). Therefore, studying compressed heavy ions is beneficial to our understanding of NS properties, such as the mass-radius relation of NS and the gravitational waveform of NS merger event such as GW170817 from LIGO/VIRGO collaboration. In particular, the ratio of the amount of $\pi $- to $\pi +$ fragments ($\pi $- /$\pi +)$ created as the compressed heavy ions disintegrates is strongly sensitive to the curvature parameter Lsym of nuclear EoS, which in-turn is strongly sensitive to NS properties. To this end, we performed the SpiRIT experiment in which radioactive $^{\mathrm{132}}$Sn {\&} $^{\mathrm{108}}$Sn isotopes are generated and accelerated to relativistic speed by Rare Isotope Beam Factory (RIBF) in RIKEN, and are set to collide with stationary $^{\mathrm{124}}$Sn {\&} $^{\mathrm{108}}$Sn targets respectively. The collision compresses the nucleus to higher density before they disintegrate into fragments. The amount and momentum of pion fragments are measured with SAMURAI Pion Reconstruction and Ion Tracker (SpiRIT) Time Projection Chamber (TPC) immediately downstream of the target. In this talk, I will present a Bayesian analysis of the data with a transport quantum Molecular Dynamic model to constrain the EoS parameters.

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Authors

  • Chun Yuen Tsang

    Michigan State University

  • Samantha Hudson

    Liverpool, Konkoly, STScI, PMO, SKA, Yale, National Superconducting Cyclotron Laboratory, Western Michigan University, School of Physics, Peking University, NSCL, Department of Physics, Korea University, Rare Isotope Science Project, Institute for Basic Science, Daejeon, Department of Physics, Western Michigan University, Korea University, Riken, Kyoto University, NCSL, New Mexico State University, Jefferson Lab, Lebanon Valley College, Lawrence Berkeley National Laboratory, Youngstown State University, Cleveland State University, Department of Physics, SUNY Buffalo State, Buffalo, NY 14222 USA, Department of Physics, SUNY Buffalo State, Buffalo, NY 14222

  • Samantha Hudson

    Liverpool, Konkoly, STScI, PMO, SKA, Yale, National Superconducting Cyclotron Laboratory, Western Michigan University, School of Physics, Peking University, NSCL, Department of Physics, Korea University, Rare Isotope Science Project, Institute for Basic Science, Daejeon, Department of Physics, Western Michigan University, Korea University, Riken, Kyoto University, NCSL, New Mexico State University, Jefferson Lab, Lebanon Valley College, Lawrence Berkeley National Laboratory, Youngstown State University, Cleveland State University, Department of Physics, SUNY Buffalo State, Buffalo, NY 14222 USA, Department of Physics, SUNY Buffalo State, Buffalo, NY 14222

  • Samantha Hudson

    Liverpool, Konkoly, STScI, PMO, SKA, Yale, National Superconducting Cyclotron Laboratory, Western Michigan University, School of Physics, Peking University, NSCL, Department of Physics, Korea University, Rare Isotope Science Project, Institute for Basic Science, Daejeon, Department of Physics, Western Michigan University, Korea University, Riken, Kyoto University, NCSL, New Mexico State University, Jefferson Lab, Lebanon Valley College, Lawrence Berkeley National Laboratory, Youngstown State University, Cleveland State University, Department of Physics, SUNY Buffalo State, Buffalo, NY 14222 USA, Department of Physics, SUNY Buffalo State, Buffalo, NY 14222

  • Samantha Hudson

    Liverpool, Konkoly, STScI, PMO, SKA, Yale, National Superconducting Cyclotron Laboratory, Western Michigan University, School of Physics, Peking University, NSCL, Department of Physics, Korea University, Rare Isotope Science Project, Institute for Basic Science, Daejeon, Department of Physics, Western Michigan University, Korea University, Riken, Kyoto University, NCSL, New Mexico State University, Jefferson Lab, Lebanon Valley College, Lawrence Berkeley National Laboratory, Youngstown State University, Cleveland State University, Department of Physics, SUNY Buffalo State, Buffalo, NY 14222 USA, Department of Physics, SUNY Buffalo State, Buffalo, NY 14222

  • Samantha Hudson

    Liverpool, Konkoly, STScI, PMO, SKA, Yale, National Superconducting Cyclotron Laboratory, Western Michigan University, School of Physics, Peking University, NSCL, Department of Physics, Korea University, Rare Isotope Science Project, Institute for Basic Science, Daejeon, Department of Physics, Western Michigan University, Korea University, Riken, Kyoto University, NCSL, New Mexico State University, Jefferson Lab, Lebanon Valley College, Lawrence Berkeley National Laboratory, Youngstown State University, Cleveland State University, Department of Physics, SUNY Buffalo State, Buffalo, NY 14222 USA, Department of Physics, SUNY Buffalo State, Buffalo, NY 14222

  • Samantha Hudson

    Liverpool, Konkoly, STScI, PMO, SKA, Yale, National Superconducting Cyclotron Laboratory, Western Michigan University, School of Physics, Peking University, NSCL, Department of Physics, Korea University, Rare Isotope Science Project, Institute for Basic Science, Daejeon, Department of Physics, Western Michigan University, Korea University, Riken, Kyoto University, NCSL, New Mexico State University, Jefferson Lab, Lebanon Valley College, Lawrence Berkeley National Laboratory, Youngstown State University, Cleveland State University, Department of Physics, SUNY Buffalo State, Buffalo, NY 14222 USA, Department of Physics, SUNY Buffalo State, Buffalo, NY 14222

  • Samantha Hudson

    Liverpool, Konkoly, STScI, PMO, SKA, Yale, National Superconducting Cyclotron Laboratory, Western Michigan University, School of Physics, Peking University, NSCL, Department of Physics, Korea University, Rare Isotope Science Project, Institute for Basic Science, Daejeon, Department of Physics, Western Michigan University, Korea University, Riken, Kyoto University, NCSL, New Mexico State University, Jefferson Lab, Lebanon Valley College, Lawrence Berkeley National Laboratory, Youngstown State University, Cleveland State University, Department of Physics, SUNY Buffalo State, Buffalo, NY 14222 USA, Department of Physics, SUNY Buffalo State, Buffalo, NY 14222

  • Samantha Hudson

    Liverpool, Konkoly, STScI, PMO, SKA, Yale, National Superconducting Cyclotron Laboratory, Western Michigan University, School of Physics, Peking University, NSCL, Department of Physics, Korea University, Rare Isotope Science Project, Institute for Basic Science, Daejeon, Department of Physics, Western Michigan University, Korea University, Riken, Kyoto University, NCSL, New Mexico State University, Jefferson Lab, Lebanon Valley College, Lawrence Berkeley National Laboratory, Youngstown State University, Cleveland State University, Department of Physics, SUNY Buffalo State, Buffalo, NY 14222 USA, Department of Physics, SUNY Buffalo State, Buffalo, NY 14222

  • Samantha Hudson

    Liverpool, Konkoly, STScI, PMO, SKA, Yale, National Superconducting Cyclotron Laboratory, Western Michigan University, School of Physics, Peking University, NSCL, Department of Physics, Korea University, Rare Isotope Science Project, Institute for Basic Science, Daejeon, Department of Physics, Western Michigan University, Korea University, Riken, Kyoto University, NCSL, New Mexico State University, Jefferson Lab, Lebanon Valley College, Lawrence Berkeley National Laboratory, Youngstown State University, Cleveland State University, Department of Physics, SUNY Buffalo State, Buffalo, NY 14222 USA, Department of Physics, SUNY Buffalo State, Buffalo, NY 14222

  • Samantha Hudson

    Liverpool, Konkoly, STScI, PMO, SKA, Yale, National Superconducting Cyclotron Laboratory, Western Michigan University, School of Physics, Peking University, NSCL, Department of Physics, Korea University, Rare Isotope Science Project, Institute for Basic Science, Daejeon, Department of Physics, Western Michigan University, Korea University, Riken, Kyoto University, NCSL, New Mexico State University, Jefferson Lab, Lebanon Valley College, Lawrence Berkeley National Laboratory, Youngstown State University, Cleveland State University, Department of Physics, SUNY Buffalo State, Buffalo, NY 14222 USA, Department of Physics, SUNY Buffalo State, Buffalo, NY 14222